Limiting block space isn't the only way to increase mining fees.  Removing/reducing the block reward has the same effect.  Once the reward is less than the cost to mine, most miners will require a tx fee.  Given this incentive, there's really no reason to limit the block size.  It is in the miners best interest to set the limit as high as possible so they can receive the maximum amount of tx fees possible.  For this reason alone I foresee the block limit rising significantly.

Someone could try to disrupt the network with an extremely large block that contains millions of satoshi transactions, but it wouldn't be worth the effort.  Not to mention, miners could set their own size limits (for just this reason) & the consensus could be to orphan the block.